下外殼直管

Wasn't sure a replacement tube would line up as well as the original, but it fit the reinforced T-socket snugly with no wobble at all. The rust-resistant finish feels sturdy too, and after a few weeks outside it's holding up fine.

Slid this onto my reinforced T-socket and the whole frame feels way sturdier now, no twisting at all. The rust-resistant finish is a nice bonus since it sits outside in the rain. Fit was spot on, no wobble.

Swapped this straight tube onto my reinforced T-socket frame and the wobble I'd been fighting is basically gone. The weatherproof finish has held up fine through a few weeks of rain, no rust spots so far.